}

    @Test
    @DisplayName("hasCapability(cap): propagates CIFSException on failure")
    void hasCapability_throws() throws Exception {
        // Arrange
        when(handle.hasCapability(anyInt())).thenThrow(new CIFSException("capability check failed"));

        // Act + Assert
        CIFSException ex = assertThrows(CIFSException.class, () -> handle.hasCapability(42));

    /**
     * Test for unwrap() method throwing exception.
     * Verifies that unwrap can throw exceptions when appropriate.
     */
    @Test
    void testUnwrap_throwsException() {
        when(smbTree.unwrap(any())).thenThrow(new ClassCastException("Cannot unwrap to specified type"));

        assertThrows(ClassCastException.class, () -> smbTree.unwrap(CustomSmbTree.class),
                "Should throw ClassCastException when type is incompatible");

     * @throws CIFSException
     */
    @Test
    void testGetServerTimeZoneOffset_throwsCIFSException() throws CIFSException {
        when(smbTreeHandle.getServerTimeZoneOffset()).thenThrow(new CIFSException("Test Exception"));
        assertThrows(CIFSException.class, () -> smbTreeHandle.getServerTimeZoneOffset(),
                "getServerTimeZoneOffset() should throw CIFSException");
    }

    /**

        // Arrange
        SmbPipeOutputStream out = newStream();
        CIFSException boom = new CIFSException("tree-fail");
        when(handle.ensureTreeConnected()).thenThrow(boom);

        // Act + Assert
        CIFSException ex = assertThrows(CIFSException.class, out::ensureTreeConnected);
        assertEquals("tree-fail", ex.getMessage());

    }

    @Test
    @DisplayName("send throws CIFSException for null request when implementation does")
    void send_nullRequest_throws() throws Exception {
        // Arrange
        when(tree.send(isNull())).thenThrow(new CIFSException("null request"));

        // Act
        CIFSException ex = assertThrows(CIFSException.class, () -> tree.send(null));

        // Assert
        assertEquals("null request", ex.getMessage());

    @Test
    @DisplayName("overlaps throws CIFSException when implementation fails")
    void overlapsThrowsCifsException() throws Exception {
        when(locator.overlaps(any())).thenThrow(new CIFSException("Simulated failure"));

        CIFSException ex = assertThrows(CIFSException.class, () -> locator.overlaps(other));
        assertTrue(ex.getMessage().contains("Simulated failure"));

    @Test
    @DisplayName("toInetAddress should handle UnknownHostException")
    void testToInetAddressWithException() throws UnknownHostException {
        // Given
        when(mockAddress.toInetAddress()).thenThrow(new UnknownHostException("Host not found"));

        // When & Then
        assertThrows(UnknownHostException.class, () -> {
            mockAddress.toInetAddress();
        }, "Should propagate UnknownHostException");

        // we need to use a method that can throw checked exceptions or wrap it in a RuntimeException
        @SuppressWarnings("unchecked")
        Supplier<String> supplier = mock(Supplier.class);
        when(supplier.get()).thenThrow(new RuntimeException(new SmbUnsupportedOperationException("boom")));

        // Act & Assert: the exception is propagated and interaction recorded once

        // and a mock file that throws an exception when getAttributes is called
        SmbException expectedException = new SmbException("Failed to get attributes");
        when(mockFile.getAttributes()).thenThrow(expectedException);

        // When calling accept
        // Then an SmbException should be thrown
        SmbException thrown = assertThrows(SmbException.class, () -> {
            dosFileFilter.accept(mockFile);

        // Mock transport to throw IOException - simulating connection failure
        when(mockTransportPool.getSmbTransport(any(CIFSContext.class), anyString(), anyInt(), anyBoolean(), anyBoolean()))
                .thenThrow(new IOException("Connection failed"));

        // Instantiate the class under test
        dfsImpl = new DfsImpl(mockContext);
    }

    // Test for the constructor
    @Test
    void testDfsImplConstructor() {